It's its ass. To put it mildly, its ass is experiencing sexual skin swelling now. This kind of personality is skin and bones, which is called the old world monkey in the jargon. This is common among primates in the old world. Like macaques, sometimes macaques who see Monkey Mountain in the zoo will appear, not only red, but also red in the face.

Morris Goodman, a biologist at Wayne State University in the United States, and others published a paper in the Proceedings of the National Academy of Sciences, suggesting that chimpanzees should be classified as humans.

The reason is that they chose humans, chimpanzees, gorillas, orangutans, monkeys and mice in the old world as the research objects, and found that the DNA sequences of 97 functional genes of these six species are 99.4% consistent with humans. In view of the fact that genetic similarity accounts for the vast majority and the difference is only a small part, they believe that chimpanzees should belong to the genus of human beings in biological classification, that is, their brothers.

Extended data:

For the problems caused by the same and similar number of genes between humans and chimpanzees, gene hunter Venter, who participated in and promoted the early completion of the human genome project, believes that there are not many genes supporting biological determinism. The wonderful diversity of human beings is not inherent in the genetic code. Our environment plays a decisive role.

However, other researchers' explanations are more firm. They believe that even if there are huge differences between humans and chimpanzees, only 33 genes are needed. The key is how the environment and experience turn these genes on or off.